/Engine/Source/Runtime/Engine/Public/SaveGameSystem.h
Delete the named savegame asyncronously. Default implementation runs blocking version on a background thread
virtual void DeleteGameAsync ( bool bAttemptToUseUI, const TCHAR * Name, [FPlatformUserId](API\Runtime\Core\Misc\FPlatformUserId) PlatformUserId, [FSaveGameAsyncOpCompleteCallback](API\Runtime\Engine\ISaveGameSystem\FSaveGameAsyncOpCompleteCallback) Callback )